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| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-03-10 15:28:04 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-19 19:19:55 +0200 |
| commit | 61c4628b538608c1a85211ed8438136adfeb9a95 (patch) | |
| tree | 290a695299a363153bc692e6d705ac680d64359e /arch/x86/math-emu/reg_ld_str.c | |
| parent | fa5c4639419668cbb18ca3d20c1253559a3b43ae (diff) | |
| download | linux-61c4628b538608c1a85211ed8438136adfeb9a95.tar.gz linux-61c4628b538608c1a85211ed8438136adfeb9a95.tar.bz2 linux-61c4628b538608c1a85211ed8438136adfeb9a95.zip | |
x86, fpu: split FPU state from task struct - v5
Split the FPU save area from the task struct. This allows easy migration
of FPU context, and it's generally cleaner. It also allows the following
two optimizations:
1) only allocate when the application actually uses FPU, so in the first
lazy FPU trap. This could save memory for non-fpu using apps. Next patch
does this lazy allocation.
2) allocate the right size for the actual cpu rather than 512 bytes always.
Patches enabling xsave/xrstor support (coming shortly) will take advantage
of this.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/math-emu/reg_ld_str.c')
| -rw-r--r-- | arch/x86/math-emu/reg_ld_str.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/math-emu/reg_ld_str.c b/arch/x86/math-emu/reg_ld_str.c index 02af772a24db..d597fe7423c9 100644 --- a/arch/x86/math-emu/reg_ld_str.c +++ b/arch/x86/math-emu/reg_ld_str.c @@ -1180,8 +1180,8 @@ u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d) control_word |= 0xffff0040; partial_status = status_word() | 0xffff0000; fpu_tag_word |= 0xffff0000; - I387.soft.fcs &= ~0xf8000000; - I387.soft.fos |= 0xffff0000; + I387->soft.fcs &= ~0xf8000000; + I387->soft.fos |= 0xffff0000; #endif /* PECULIAR_486 */ if (__copy_to_user(d, &control_word, 7 * 4)) FPU_abort; |